1 #ifndef _FS_CEPH_SUPER_H 2 #define _FS_CEPH_SUPER_H 3 4 #include <linux/ceph/ceph_debug.h> 5 6 #include <asm/unaligned.h> 7 #include <linux/backing-dev.h> 8 #include <linux/completion.h> 9 #include <linux/exportfs.h> 10 #include <linux/fs.h> 11 #include <linux/mempool.h> 12 #include <linux/pagemap.h> 13 #include <linux/wait.h> 14 #include <linux/writeback.h> 15 #include <linux/slab.h> 16 #include <linux/posix_acl.h> 17 18 #include <linux/ceph/libceph.h> 19 20 #ifdef CONFIG_CEPH_FSCACHE 21 #include <linux/fscache.h> 22 #endif 23 24 /* f_type in struct statfs */ 25 #define CEPH_SUPER_MAGIC 0x00c36400 26 27 /* large granularity for statfs utilization stats to facilitate 28 * large volume sizes on 32-bit machines. */ 29 #define CEPH_BLOCK_SHIFT 22 /* 4 MB */ 30 #define CEPH_BLOCK (1 << CEPH_BLOCK_SHIFT) 31 32 #define CEPH_MOUNT_OPT_DIRSTAT (1<<4) /* `cat dirname` for stats */ 33 #define CEPH_MOUNT_OPT_RBYTES (1<<5) /* dir st_bytes = rbytes */ 34 #define CEPH_MOUNT_OPT_NOASYNCREADDIR (1<<7) /* no dcache readdir */ 35 #define CEPH_MOUNT_OPT_INO32 (1<<8) /* 32 bit inos */ 36 #define CEPH_MOUNT_OPT_DCACHE (1<<9) /* use dcache for readdir etc */ 37 #define CEPH_MOUNT_OPT_FSCACHE (1<<10) /* use fscache */ 38 #define CEPH_MOUNT_OPT_NOPOOLPERM (1<<11) /* no pool permission check */ 39 40 #define CEPH_MOUNT_OPT_DEFAULT CEPH_MOUNT_OPT_DCACHE 41 42 #define ceph_set_mount_opt(fsc, opt) \ 43 (fsc)->mount_options->flags |= CEPH_MOUNT_OPT_##opt; 44 #define ceph_test_mount_opt(fsc, opt) \ 45 (!!((fsc)->mount_options->flags & CEPH_MOUNT_OPT_##opt)) 46 47 #define CEPH_RSIZE_DEFAULT 0 /* max read size */ 48 #define CEPH_RASIZE_DEFAULT (8192*1024) /* readahead */ 49 #define CEPH_MAX_READDIR_DEFAULT 1024 50 #define CEPH_MAX_READDIR_BYTES_DEFAULT (512*1024) 51 #define CEPH_SNAPDIRNAME_DEFAULT ".snap" 52 53 struct ceph_mount_options { 54 int flags; 55 int sb_flags; 56 57 int wsize; /* max write size */ 58 int rsize; /* max read size */ 59 int rasize; /* max readahead */ 60 int congestion_kb; /* max writeback in flight */ 61 int caps_wanted_delay_min, caps_wanted_delay_max; 62 int cap_release_safety; 63 int max_readdir; /* max readdir result (entires) */ 64 int max_readdir_bytes; /* max readdir result (bytes) */ 65 66 /* 67 * everything above this point can be memcmp'd; everything below 68 * is handled in compare_mount_options() 69 */ 70 71 char *snapdir_name; /* default ".snap" */ 72 char *mds_namespace; /* default NULL */ 73 char *server_path; /* default "/" */ 74 }; 75 76 struct ceph_fs_client { 77 struct super_block *sb; 78 79 struct ceph_mount_options *mount_options; 80 struct ceph_client *client; 81 82 unsigned long mount_state; 83 int min_caps; /* min caps i added */ 84 85 struct ceph_mds_client *mdsc; 86 87 /* writeback */ 88 mempool_t *wb_pagevec_pool; 89 struct workqueue_struct *wb_wq; 90 struct workqueue_struct *pg_inv_wq; 91 struct workqueue_struct *trunc_wq; 92 atomic_long_t writeback_count; 93 94 struct backing_dev_info backing_dev_info; 95 96 #ifdef CONFIG_DEBUG_FS 97 struct dentry *debugfs_dentry_lru, *debugfs_caps; 98 struct dentry *debugfs_congestion_kb; 99 struct dentry *debugfs_bdi; 100 struct dentry *debugfs_mdsc, *debugfs_mdsmap; 101 struct dentry *debugfs_mds_sessions; 102 #endif 103 104 #ifdef CONFIG_CEPH_FSCACHE 105 struct fscache_cookie *fscache; 106 #endif 107 }; 108 109 110 /* 111 * File i/o capability. This tracks shared state with the metadata 112 * server that allows us to cache or writeback attributes or to read 113 * and write data. For any given inode, we should have one or more 114 * capabilities, one issued by each metadata server, and our 115 * cumulative access is the OR of all issued capabilities. 116 * 117 * Each cap is referenced by the inode's i_caps rbtree and by per-mds 118 * session capability lists. 119 */ 120 struct ceph_cap { 121 struct ceph_inode_info *ci; 122 struct rb_node ci_node; /* per-ci cap tree */ 123 struct ceph_mds_session *session; 124 struct list_head session_caps; /* per-session caplist */ 125 u64 cap_id; /* unique cap id (mds provided) */ 126 union { 127 /* in-use caps */ 128 struct { 129 int issued; /* latest, from the mds */ 130 int implemented; /* implemented superset of 131 issued (for revocation) */ 132 int mds, mds_wanted; 133 }; 134 /* caps to release */ 135 struct { 136 u64 cap_ino; 137 int queue_release; 138 }; 139 }; 140 u32 seq, issue_seq, mseq; 141 u32 cap_gen; /* active/stale cycle */ 142 unsigned long last_used; 143 struct list_head caps_item; 144 }; 145 146 #define CHECK_CAPS_NODELAY 1 /* do not delay any further */ 147 #define CHECK_CAPS_AUTHONLY 2 /* only check auth cap */ 148 #define CHECK_CAPS_FLUSH 4 /* flush any dirty caps */ 149 150 struct ceph_cap_flush { 151 u64 tid; 152 int caps; /* 0 means capsnap */ 153 bool wake; /* wake up flush waiters when finish ? */ 154 struct list_head g_list; // global 155 struct list_head i_list; // per inode 156 }; 157 158 /* 159 * Snapped cap state that is pending flush to mds. When a snapshot occurs, 160 * we first complete any in-process sync writes and writeback any dirty 161 * data before flushing the snapped state (tracked here) back to the MDS. 162 */ 163 struct ceph_cap_snap { 164 atomic_t nref; 165 struct list_head ci_item; 166 167 struct ceph_cap_flush cap_flush; 168 169 u64 follows; 170 int issued, dirty; 171 struct ceph_snap_context *context; 172 173 umode_t mode; 174 kuid_t uid; 175 kgid_t gid; 176 177 struct ceph_buffer *xattr_blob; 178 u64 xattr_version; 179 180 u64 size; 181 struct timespec mtime, atime, ctime; 182 u64 time_warp_seq; 183 int writing; /* a sync write is still in progress */ 184 int dirty_pages; /* dirty pages awaiting writeback */ 185 bool inline_data; 186 bool need_flush; 187 }; 188 189 static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap) 190 { 191 if (atomic_dec_and_test(&capsnap->nref)) { 192 if (capsnap->xattr_blob) 193 ceph_buffer_put(capsnap->xattr_blob); 194 kfree(capsnap); 195 } 196 } 197 198 /* 199 * The frag tree describes how a directory is fragmented, potentially across 200 * multiple metadata servers. It is also used to indicate points where 201 * metadata authority is delegated, and whether/where metadata is replicated. 202 * 203 * A _leaf_ frag will be present in the i_fragtree IFF there is 204 * delegation info. That is, if mds >= 0 || ndist > 0. 205 */ 206 #define CEPH_MAX_DIRFRAG_REP 4 207 208 struct ceph_inode_frag { 209 struct rb_node node; 210 211 /* fragtree state */ 212 u32 frag; 213 int split_by; /* i.e. 2^(split_by) children */ 214 215 /* delegation and replication info */ 216 int mds; /* -1 if same authority as parent */ 217 int ndist; /* >0 if replicated */ 218 int dist[CEPH_MAX_DIRFRAG_REP]; 219 }; 220 221 /* 222 * We cache inode xattrs as an encoded blob until they are first used, 223 * at which point we parse them into an rbtree. 224 */ 225 struct ceph_inode_xattr { 226 struct rb_node node; 227 228 const char *name; 229 int name_len; 230 const char *val; 231 int val_len; 232 int dirty; 233 234 int should_free_name; 235 int should_free_val; 236 }; 237 238 /* 239 * Ceph dentry state 240 */ 241 struct ceph_dentry_info { 242 struct ceph_mds_session *lease_session; 243 u32 lease_gen, lease_shared_gen; 244 u32 lease_seq; 245 unsigned long lease_renew_after, lease_renew_from; 246 struct list_head lru; 247 struct dentry *dentry; 248 unsigned long time; 249 u64 offset; 250 }; 251 252 struct ceph_inode_xattrs_info { 253 /* 254 * (still encoded) xattr blob. we avoid the overhead of parsing 255 * this until someone actually calls getxattr, etc. 256 * 257 * blob->vec.iov_len == 4 implies there are no xattrs; blob == 258 * NULL means we don't know. 259 */ 260 struct ceph_buffer *blob, *prealloc_blob; 261 262 struct rb_root index; 263 bool dirty; 264 int count; 265 int names_size; 266 int vals_size; 267 u64 version, index_version; 268 }; 269 270 /* 271 * Ceph inode. 272 */ 273 struct ceph_inode_info { 274 struct ceph_vino i_vino; /* ceph ino + snap */ 275 276 spinlock_t i_ceph_lock; 277 278 u64 i_version; 279 u64 i_inline_version; 280 u32 i_time_warp_seq; 281 282 unsigned i_ceph_flags; 283 atomic64_t i_release_count; 284 atomic64_t i_ordered_count; 285 atomic64_t i_complete_seq[2]; 286 287 struct ceph_dir_layout i_dir_layout; 288 struct ceph_file_layout i_layout; 289 char *i_symlink; 290 291 /* for dirs */ 292 struct timespec i_rctime; 293 u64 i_rbytes, i_rfiles, i_rsubdirs; 294 u64 i_files, i_subdirs; 295 296 struct rb_root i_fragtree; 297 int i_fragtree_nsplits; 298 struct mutex i_fragtree_mutex; 299 300 struct ceph_inode_xattrs_info i_xattrs; 301 302 /* capabilities. protected _both_ by i_ceph_lock and cap->session's 303 * s_mutex. */ 304 struct rb_root i_caps; /* cap list */ 305 struct ceph_cap *i_auth_cap; /* authoritative cap, if any */ 306 unsigned i_dirty_caps, i_flushing_caps; /* mask of dirtied fields */ 307 struct list_head i_dirty_item, i_flushing_item; 308 /* we need to track cap writeback on a per-cap-bit basis, to allow 309 * overlapping, pipelined cap flushes to the mds. we can probably 310 * reduce the tid to 8 bits if we're concerned about inode size. */ 311 struct ceph_cap_flush *i_prealloc_cap_flush; 312 struct list_head i_cap_flush_list; 313 wait_queue_head_t i_cap_wq; /* threads waiting on a capability */ 314 unsigned long i_hold_caps_min; /* jiffies */ 315 unsigned long i_hold_caps_max; /* jiffies */ 316 struct list_head i_cap_delay_list; /* for delayed cap release to mds */ 317 struct ceph_cap_reservation i_cap_migration_resv; 318 struct list_head i_cap_snaps; /* snapped state pending flush to mds */ 319 struct ceph_snap_context *i_head_snapc; /* set if wr_buffer_head > 0 or 320 dirty|flushing caps */ 321 unsigned i_snap_caps; /* cap bits for snapped files */ 322 323 int i_nr_by_mode[CEPH_FILE_MODE_BITS]; /* open file counts */ 324 325 struct mutex i_truncate_mutex; 326 u32 i_truncate_seq; /* last truncate to smaller size */ 327 u64 i_truncate_size; /* and the size we last truncated down to */ 328 int i_truncate_pending; /* still need to call vmtruncate */ 329 330 u64 i_max_size; /* max file size authorized by mds */ 331 u64 i_reported_size; /* (max_)size reported to or requested of mds */ 332 u64 i_wanted_max_size; /* offset we'd like to write too */ 333 u64 i_requested_max_size; /* max_size we've requested */ 334 335 /* held references to caps */ 336 int i_pin_ref; 337 int i_rd_ref, i_rdcache_ref, i_wr_ref, i_wb_ref; 338 int i_wrbuffer_ref, i_wrbuffer_ref_head; 339 u32 i_shared_gen; /* increment each time we get FILE_SHARED */ 340 u32 i_rdcache_gen; /* incremented each time we get FILE_CACHE. */ 341 u32 i_rdcache_revoking; /* RDCACHE gen to async invalidate, if any */ 342 343 struct list_head i_unsafe_writes; /* uncommitted sync writes */ 344 struct list_head i_unsafe_dirops; /* uncommitted mds dir ops */ 345 struct list_head i_unsafe_iops; /* uncommitted mds inode ops */ 346 spinlock_t i_unsafe_lock; 347 348 struct ceph_snap_realm *i_snap_realm; /* snap realm (if caps) */ 349 int i_snap_realm_counter; /* snap realm (if caps) */ 350 struct list_head i_snap_realm_item; 351 struct list_head i_snap_flush_item; 352 353 struct work_struct i_wb_work; /* writeback work */ 354 struct work_struct i_pg_inv_work; /* page invalidation work */ 355 356 struct work_struct i_vmtruncate_work; 357 358 #ifdef CONFIG_CEPH_FSCACHE 359 struct fscache_cookie *fscache; 360 u32 i_fscache_gen; 361 #endif 362 struct inode vfs_inode; /* at end */ 363 }; 364 365 static inline struct ceph_inode_info *ceph_inode(struct inode *inode) 366 { 367 return container_of(inode, struct ceph_inode_info, vfs_inode); 368 } 369 370 static inline struct ceph_fs_client *ceph_inode_to_client(struct inode *inode) 371 { 372 return (struct ceph_fs_client *)inode->i_sb->s_fs_info; 373 } 374 375 static inline struct ceph_fs_client *ceph_sb_to_client(struct super_block *sb) 376 { 377 return (struct ceph_fs_client *)sb->s_fs_info; 378 } 379 380 static inline struct ceph_vino ceph_vino(struct inode *inode) 381 { 382 return ceph_inode(inode)->i_vino; 383 } 384 385 /* 386 * ino_t is <64 bits on many architectures, blech. 387 * 388 * i_ino (kernel inode) st_ino (userspace) 389 * i386 32 32 390 * x86_64+ino32 64 32 391 * x86_64 64 64 392 */ 393 static inline u32 ceph_ino_to_ino32(__u64 vino) 394 { 395 u32 ino = vino & 0xffffffff; 396 ino ^= vino >> 32; 397 if (!ino) 398 ino = 2; 399 return ino; 400 } 401 402 /* 403 * kernel i_ino value 404 */ 405 static inline ino_t ceph_vino_to_ino(struct ceph_vino vino) 406 { 407 #if BITS_PER_LONG == 32 408 return ceph_ino_to_ino32(vino.ino); 409 #else 410 return (ino_t)vino.ino; 411 #endif 412 } 413 414 /* 415 * user-visible ino (stat, filldir) 416 */ 417 #if BITS_PER_LONG == 32 418 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) 419 { 420 return ino; 421 } 422 #else 423 static inline ino_t ceph_translate_ino(struct super_block *sb, ino_t ino) 424 { 425 if (ceph_test_mount_opt(ceph_sb_to_client(sb), INO32)) 426 ino = ceph_ino_to_ino32(ino); 427 return ino; 428 } 429 #endif 430 431 432 /* for printf-style formatting */ 433 #define ceph_vinop(i) ceph_inode(i)->i_vino.ino, ceph_inode(i)->i_vino.snap 434 435 static inline u64 ceph_ino(struct inode *inode) 436 { 437 return ceph_inode(inode)->i_vino.ino; 438 } 439 static inline u64 ceph_snap(struct inode *inode) 440 { 441 return ceph_inode(inode)->i_vino.snap; 442 } 443 444 static inline int ceph_ino_compare(struct inode *inode, void *data) 445 { 446 struct ceph_vino *pvino = (struct ceph_vino *)data; 447 struct ceph_inode_info *ci = ceph_inode(inode); 448 return ci->i_vino.ino == pvino->ino && 449 ci->i_vino.snap == pvino->snap; 450 } 451 452 static inline struct inode *ceph_find_inode(struct super_block *sb, 453 struct ceph_vino vino) 454 { 455 ino_t t = ceph_vino_to_ino(vino); 456 return ilookup5(sb, t, ceph_ino_compare, &vino); 457 } 458 459 460 /* 461 * Ceph inode. 462 */ 463 #define CEPH_I_DIR_ORDERED (1 << 0) /* dentries in dir are ordered */ 464 #define CEPH_I_NODELAY (1 << 1) /* do not delay cap release */ 465 #define CEPH_I_FLUSH (1 << 2) /* do not delay flush of dirty metadata */ 466 #define CEPH_I_NOFLUSH (1 << 3) /* do not flush dirty caps */ 467 #define CEPH_I_POOL_PERM (1 << 4) /* pool rd/wr bits are valid */ 468 #define CEPH_I_POOL_RD (1 << 5) /* can read from pool */ 469 #define CEPH_I_POOL_WR (1 << 6) /* can write to pool */ 470 #define CEPH_I_SEC_INITED (1 << 7) /* security initialized */ 471 #define CEPH_I_CAP_DROPPED (1 << 8) /* caps were forcibly dropped */ 472 #define CEPH_I_KICK_FLUSH (1 << 9) /* kick flushing caps */ 473 #define CEPH_I_FLUSH_SNAPS (1 << 10) /* need flush snapss */ 474 475 static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci, 476 long long release_count, 477 long long ordered_count) 478 { 479 smp_mb__before_atomic(); 480 atomic64_set(&ci->i_complete_seq[0], release_count); 481 atomic64_set(&ci->i_complete_seq[1], ordered_count); 482 } 483 484 static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci) 485 { 486 atomic64_inc(&ci->i_release_count); 487 } 488 489 static inline void __ceph_dir_clear_ordered(struct ceph_inode_info *ci) 490 { 491 atomic64_inc(&ci->i_ordered_count); 492 } 493 494 static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci) 495 { 496 return atomic64_read(&ci->i_complete_seq[0]) == 497 atomic64_read(&ci->i_release_count); 498 } 499 500 static inline bool __ceph_dir_is_complete_ordered(struct ceph_inode_info *ci) 501 { 502 return atomic64_read(&ci->i_complete_seq[0]) == 503 atomic64_read(&ci->i_release_count) && 504 atomic64_read(&ci->i_complete_seq[1]) == 505 atomic64_read(&ci->i_ordered_count); 506 } 507 508 static inline void ceph_dir_clear_complete(struct inode *inode) 509 { 510 __ceph_dir_clear_complete(ceph_inode(inode)); 511 } 512 513 static inline void ceph_dir_clear_ordered(struct inode *inode) 514 { 515 __ceph_dir_clear_ordered(ceph_inode(inode)); 516 } 517 518 static inline bool ceph_dir_is_complete_ordered(struct inode *inode) 519 { 520 bool ret = __ceph_dir_is_complete_ordered(ceph_inode(inode)); 521 smp_rmb(); 522 return ret; 523 } 524 525 /* find a specific frag @f */ 526 extern struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, 527 u32 f); 528 529 /* 530 * choose fragment for value @v. copy frag content to pfrag, if leaf 531 * exists 532 */ 533 extern u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 534 struct ceph_inode_frag *pfrag, 535 int *found); 536 537 static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry) 538 { 539 return (struct ceph_dentry_info *)dentry->d_fsdata; 540 } 541 542 /* 543 * caps helpers 544 */ 545 static inline bool __ceph_is_any_real_caps(struct ceph_inode_info *ci) 546 { 547 return !RB_EMPTY_ROOT(&ci->i_caps); 548 } 549 550 extern int __ceph_caps_issued(struct ceph_inode_info *ci, int *implemented); 551 extern int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int t); 552 extern int __ceph_caps_issued_other(struct ceph_inode_info *ci, 553 struct ceph_cap *cap); 554 555 static inline int ceph_caps_issued(struct ceph_inode_info *ci) 556 { 557 int issued; 558 spin_lock(&ci->i_ceph_lock); 559 issued = __ceph_caps_issued(ci, NULL); 560 spin_unlock(&ci->i_ceph_lock); 561 return issued; 562 } 563 564 static inline int ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, 565 int touch) 566 { 567 int r; 568 spin_lock(&ci->i_ceph_lock); 569 r = __ceph_caps_issued_mask(ci, mask, touch); 570 spin_unlock(&ci->i_ceph_lock); 571 return r; 572 } 573 574 static inline int __ceph_caps_dirty(struct ceph_inode_info *ci) 575 { 576 return ci->i_dirty_caps | ci->i_flushing_caps; 577 } 578 extern struct ceph_cap_flush *ceph_alloc_cap_flush(void); 579 extern void ceph_free_cap_flush(struct ceph_cap_flush *cf); 580 extern int __ceph_mark_dirty_caps(struct ceph_inode_info *ci, int mask, 581 struct ceph_cap_flush **pcf); 582 583 extern int __ceph_caps_revoking_other(struct ceph_inode_info *ci, 584 struct ceph_cap *ocap, int mask); 585 extern int ceph_caps_revoking(struct ceph_inode_info *ci, int mask); 586 extern int __ceph_caps_used(struct ceph_inode_info *ci); 587 588 extern int __ceph_caps_file_wanted(struct ceph_inode_info *ci); 589 590 /* 591 * wanted, by virtue of open file modes AND cap refs (buffered/cached data) 592 */ 593 static inline int __ceph_caps_wanted(struct ceph_inode_info *ci) 594 { 595 int w = __ceph_caps_file_wanted(ci) | __ceph_caps_used(ci); 596 if (w & CEPH_CAP_FILE_BUFFER) 597 w |= CEPH_CAP_FILE_EXCL; /* we want EXCL if dirty data */ 598 return w; 599 } 600 601 /* what the mds thinks we want */ 602 extern int __ceph_caps_mds_wanted(struct ceph_inode_info *ci); 603 604 extern void ceph_caps_init(struct ceph_mds_client *mdsc); 605 extern void ceph_caps_finalize(struct ceph_mds_client *mdsc); 606 extern void ceph_adjust_min_caps(struct ceph_mds_client *mdsc, int delta); 607 extern void ceph_reserve_caps(struct ceph_mds_client *mdsc, 608 struct ceph_cap_reservation *ctx, int need); 609 extern int ceph_unreserve_caps(struct ceph_mds_client *mdsc, 610 struct ceph_cap_reservation *ctx); 611 extern void ceph_reservation_status(struct ceph_fs_client *client, 612 int *total, int *avail, int *used, 613 int *reserved, int *min); 614 615 616 617 /* 618 * we keep buffered readdir results attached to file->private_data 619 */ 620 #define CEPH_F_SYNC 1 621 #define CEPH_F_ATEND 2 622 623 struct ceph_file_info { 624 short fmode; /* initialized on open */ 625 short flags; /* CEPH_F_* */ 626 627 /* readdir: position within the dir */ 628 u32 frag; 629 struct ceph_mds_request *last_readdir; 630 631 /* readdir: position within a frag */ 632 unsigned next_offset; /* offset of next chunk (last_name's + 1) */ 633 char *last_name; /* last entry in previous chunk */ 634 long long dir_release_count; 635 long long dir_ordered_count; 636 int readdir_cache_idx; 637 638 /* used for -o dirstat read() on directory thing */ 639 char *dir_info; 640 int dir_info_len; 641 }; 642 643 struct ceph_readdir_cache_control { 644 struct page *page; 645 struct dentry **dentries; 646 int index; 647 }; 648 649 /* 650 * A "snap realm" describes a subset of the file hierarchy sharing 651 * the same set of snapshots that apply to it. The realms themselves 652 * are organized into a hierarchy, such that children inherit (some of) 653 * the snapshots of their parents. 654 * 655 * All inodes within the realm that have capabilities are linked into a 656 * per-realm list. 657 */ 658 struct ceph_snap_realm { 659 u64 ino; 660 atomic_t nref; 661 struct rb_node node; 662 663 u64 created, seq; 664 u64 parent_ino; 665 u64 parent_since; /* snapid when our current parent became so */ 666 667 u64 *prior_parent_snaps; /* snaps inherited from any parents we */ 668 u32 num_prior_parent_snaps; /* had prior to parent_since */ 669 u64 *snaps; /* snaps specific to this realm */ 670 u32 num_snaps; 671 672 struct ceph_snap_realm *parent; 673 struct list_head children; /* list of child realms */ 674 struct list_head child_item; 675 676 struct list_head empty_item; /* if i have ref==0 */ 677 678 struct list_head dirty_item; /* if realm needs new context */ 679 680 /* the current set of snaps for this realm */ 681 struct ceph_snap_context *cached_context; 682 683 struct list_head inodes_with_caps; 684 spinlock_t inodes_with_caps_lock; 685 }; 686 687 static inline int default_congestion_kb(void) 688 { 689 int congestion_kb; 690 691 /* 692 * Copied from NFS 693 * 694 * congestion size, scale with available memory. 695 * 696 * 64MB: 8192k 697 * 128MB: 11585k 698 * 256MB: 16384k 699 * 512MB: 23170k 700 * 1GB: 32768k 701 * 2GB: 46340k 702 * 4GB: 65536k 703 * 8GB: 92681k 704 * 16GB: 131072k 705 * 706 * This allows larger machines to have larger/more transfers. 707 * Limit the default to 256M 708 */ 709 congestion_kb = (16*int_sqrt(totalram_pages)) << (PAGE_SHIFT-10); 710 if (congestion_kb > 256*1024) 711 congestion_kb = 256*1024; 712 713 return congestion_kb; 714 } 715 716 717 718 /* snap.c */ 719 struct ceph_snap_realm *ceph_lookup_snap_realm(struct ceph_mds_client *mdsc, 720 u64 ino); 721 extern void ceph_get_snap_realm(struct ceph_mds_client *mdsc, 722 struct ceph_snap_realm *realm); 723 extern void ceph_put_snap_realm(struct ceph_mds_client *mdsc, 724 struct ceph_snap_realm *realm); 725 extern int ceph_update_snap_trace(struct ceph_mds_client *m, 726 void *p, void *e, bool deletion, 727 struct ceph_snap_realm **realm_ret); 728 extern void ceph_handle_snap(struct ceph_mds_client *mdsc, 729 struct ceph_mds_session *session, 730 struct ceph_msg *msg); 731 extern void ceph_queue_cap_snap(struct ceph_inode_info *ci); 732 extern int __ceph_finish_cap_snap(struct ceph_inode_info *ci, 733 struct ceph_cap_snap *capsnap); 734 extern void ceph_cleanup_empty_realms(struct ceph_mds_client *mdsc); 735 736 /* 737 * a cap_snap is "pending" if it is still awaiting an in-progress 738 * sync write (that may/may not still update size, mtime, etc.). 739 */ 740 static inline bool __ceph_have_pending_cap_snap(struct ceph_inode_info *ci) 741 { 742 return !list_empty(&ci->i_cap_snaps) && 743 list_last_entry(&ci->i_cap_snaps, struct ceph_cap_snap, 744 ci_item)->writing; 745 } 746 747 /* inode.c */ 748 extern const struct inode_operations ceph_file_iops; 749 750 extern struct inode *ceph_alloc_inode(struct super_block *sb); 751 extern void ceph_destroy_inode(struct inode *inode); 752 extern int ceph_drop_inode(struct inode *inode); 753 extern void ceph_evict_inode(struct inode *inode); 754 755 extern struct inode *ceph_get_inode(struct super_block *sb, 756 struct ceph_vino vino); 757 extern struct inode *ceph_get_snapdir(struct inode *parent); 758 extern int ceph_fill_file_size(struct inode *inode, int issued, 759 u32 truncate_seq, u64 truncate_size, u64 size); 760 extern void ceph_fill_file_time(struct inode *inode, int issued, 761 u64 time_warp_seq, struct timespec *ctime, 762 struct timespec *mtime, struct timespec *atime); 763 extern int ceph_fill_trace(struct super_block *sb, 764 struct ceph_mds_request *req, 765 struct ceph_mds_session *session); 766 extern int ceph_readdir_prepopulate(struct ceph_mds_request *req, 767 struct ceph_mds_session *session); 768 769 extern int ceph_inode_holds_cap(struct inode *inode, int mask); 770 771 extern int ceph_inode_set_size(struct inode *inode, loff_t size); 772 extern void __ceph_do_pending_vmtruncate(struct inode *inode); 773 extern void ceph_queue_vmtruncate(struct inode *inode); 774 775 extern void ceph_queue_invalidate(struct inode *inode); 776 extern void ceph_queue_writeback(struct inode *inode); 777 778 extern int __ceph_do_getattr(struct inode *inode, struct page *locked_page, 779 int mask, bool force); 780 static inline int ceph_do_getattr(struct inode *inode, int mask, bool force) 781 { 782 return __ceph_do_getattr(inode, NULL, mask, force); 783 } 784 extern int ceph_permission(struct inode *inode, int mask); 785 extern int __ceph_setattr(struct inode *inode, struct iattr *attr); 786 extern int ceph_setattr(struct dentry *dentry, struct iattr *attr); 787 extern int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry, 788 struct kstat *stat); 789 790 /* xattr.c */ 791 int __ceph_setxattr(struct inode *, const char *, const void *, size_t, int); 792 ssize_t __ceph_getxattr(struct inode *, const char *, void *, size_t); 793 extern ssize_t ceph_listxattr(struct dentry *, char *, size_t); 794 extern void __ceph_build_xattrs_blob(struct ceph_inode_info *ci); 795 extern void __ceph_destroy_xattrs(struct ceph_inode_info *ci); 796 extern void __init ceph_xattr_init(void); 797 extern void ceph_xattr_exit(void); 798 extern const struct xattr_handler *ceph_xattr_handlers[]; 799 800 #ifdef CONFIG_SECURITY 801 extern bool ceph_security_xattr_deadlock(struct inode *in); 802 extern bool ceph_security_xattr_wanted(struct inode *in); 803 #else 804 static inline bool ceph_security_xattr_deadlock(struct inode *in) 805 { 806 return false; 807 } 808 static inline bool ceph_security_xattr_wanted(struct inode *in) 809 { 810 return false; 811 } 812 #endif 813 814 /* acl.c */ 815 struct ceph_acls_info { 816 void *default_acl; 817 void *acl; 818 struct ceph_pagelist *pagelist; 819 }; 820 821 #ifdef CONFIG_CEPH_FS_POSIX_ACL 822 823 struct posix_acl *ceph_get_acl(struct inode *, int); 824 int ceph_set_acl(struct inode *inode, struct posix_acl *acl, int type); 825 int ceph_pre_init_acls(struct inode *dir, umode_t *mode, 826 struct ceph_acls_info *info); 827 void ceph_init_inode_acls(struct inode *inode, struct ceph_acls_info *info); 828 void ceph_release_acls_info(struct ceph_acls_info *info); 829 830 static inline void ceph_forget_all_cached_acls(struct inode *inode) 831 { 832 forget_all_cached_acls(inode); 833 } 834 835 #else 836 837 #define ceph_get_acl NULL 838 #define ceph_set_acl NULL 839 840 static inline int ceph_pre_init_acls(struct inode *dir, umode_t *mode, 841 struct ceph_acls_info *info) 842 { 843 return 0; 844 } 845 static inline void ceph_init_inode_acls(struct inode *inode, 846 struct ceph_acls_info *info) 847 { 848 } 849 static inline void ceph_release_acls_info(struct ceph_acls_info *info) 850 { 851 } 852 static inline int ceph_acl_chmod(struct dentry *dentry, struct inode *inode) 853 { 854 return 0; 855 } 856 857 static inline void ceph_forget_all_cached_acls(struct inode *inode) 858 { 859 } 860 861 #endif 862 863 /* caps.c */ 864 extern const char *ceph_cap_string(int c); 865 extern void ceph_handle_caps(struct ceph_mds_session *session, 866 struct ceph_msg *msg); 867 extern struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc, 868 struct ceph_cap_reservation *ctx); 869 extern void ceph_add_cap(struct inode *inode, 870 struct ceph_mds_session *session, u64 cap_id, 871 int fmode, unsigned issued, unsigned wanted, 872 unsigned cap, unsigned seq, u64 realmino, int flags, 873 struct ceph_cap **new_cap); 874 extern void __ceph_remove_cap(struct ceph_cap *cap, bool queue_release); 875 extern void ceph_put_cap(struct ceph_mds_client *mdsc, 876 struct ceph_cap *cap); 877 extern int ceph_is_any_caps(struct inode *inode); 878 879 extern void ceph_queue_caps_release(struct inode *inode); 880 extern int ceph_write_inode(struct inode *inode, struct writeback_control *wbc); 881 extern int ceph_fsync(struct file *file, loff_t start, loff_t end, 882 int datasync); 883 extern void ceph_early_kick_flushing_caps(struct ceph_mds_client *mdsc, 884 struct ceph_mds_session *session); 885 extern void ceph_kick_flushing_caps(struct ceph_mds_client *mdsc, 886 struct ceph_mds_session *session); 887 extern struct ceph_cap *ceph_get_cap_for_mds(struct ceph_inode_info *ci, 888 int mds); 889 extern int ceph_get_cap_mds(struct inode *inode); 890 extern void ceph_get_cap_refs(struct ceph_inode_info *ci, int caps); 891 extern void ceph_put_cap_refs(struct ceph_inode_info *ci, int had); 892 extern void ceph_put_wrbuffer_cap_refs(struct ceph_inode_info *ci, int nr, 893 struct ceph_snap_context *snapc); 894 extern void ceph_flush_snaps(struct ceph_inode_info *ci, 895 struct ceph_mds_session **psession); 896 extern void ceph_check_caps(struct ceph_inode_info *ci, int flags, 897 struct ceph_mds_session *session); 898 extern void ceph_check_delayed_caps(struct ceph_mds_client *mdsc); 899 extern void ceph_flush_dirty_caps(struct ceph_mds_client *mdsc); 900 901 extern int ceph_encode_inode_release(void **p, struct inode *inode, 902 int mds, int drop, int unless, int force); 903 extern int ceph_encode_dentry_release(void **p, struct dentry *dn, 904 int mds, int drop, int unless); 905 906 extern int ceph_get_caps(struct ceph_inode_info *ci, int need, int want, 907 loff_t endoff, int *got, struct page **pinned_page); 908 909 /* for counting open files by mode */ 910 extern void __ceph_get_fmode(struct ceph_inode_info *ci, int mode); 911 extern void ceph_put_fmode(struct ceph_inode_info *ci, int mode); 912 913 /* addr.c */ 914 extern const struct address_space_operations ceph_aops; 915 extern int ceph_mmap(struct file *file, struct vm_area_struct *vma); 916 extern int ceph_uninline_data(struct file *filp, struct page *locked_page); 917 extern int ceph_pool_perm_check(struct ceph_inode_info *ci, int need); 918 extern void ceph_pool_perm_destroy(struct ceph_mds_client* mdsc); 919 920 /* file.c */ 921 extern const struct file_operations ceph_file_fops; 922 923 extern int ceph_renew_caps(struct inode *inode); 924 extern int ceph_open(struct inode *inode, struct file *file); 925 extern int ceph_atomic_open(struct inode *dir, struct dentry *dentry, 926 struct file *file, unsigned flags, umode_t mode, 927 int *opened); 928 extern int ceph_release(struct inode *inode, struct file *filp); 929 extern void ceph_fill_inline_data(struct inode *inode, struct page *locked_page, 930 char *data, size_t len); 931 extern void ceph_sync_write_wait(struct inode *inode); 932 /* dir.c */ 933 extern const struct file_operations ceph_dir_fops; 934 extern const struct file_operations ceph_snapdir_fops; 935 extern const struct inode_operations ceph_dir_iops; 936 extern const struct inode_operations ceph_snapdir_iops; 937 extern const struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops, 938 ceph_snapdir_dentry_ops; 939 940 extern loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order); 941 extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry); 942 extern int ceph_handle_snapdir(struct ceph_mds_request *req, 943 struct dentry *dentry, int err); 944 extern struct dentry *ceph_finish_lookup(struct ceph_mds_request *req, 945 struct dentry *dentry, int err); 946 947 extern void ceph_dentry_lru_add(struct dentry *dn); 948 extern void ceph_dentry_lru_touch(struct dentry *dn); 949 extern void ceph_dentry_lru_del(struct dentry *dn); 950 extern void ceph_invalidate_dentry_lease(struct dentry *dentry); 951 extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn); 952 extern void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl); 953 954 /* 955 * our d_ops vary depending on whether the inode is live, 956 * snapshotted (read-only), or a virtual ".snap" directory. 957 */ 958 int ceph_init_dentry(struct dentry *dentry); 959 960 961 /* ioctl.c */ 962 extern long ceph_ioctl(struct file *file, unsigned int cmd, unsigned long arg); 963 964 /* export.c */ 965 extern const struct export_operations ceph_export_ops; 966 967 /* locks.c */ 968 extern __init void ceph_flock_init(void); 969 extern int ceph_lock(struct file *file, int cmd, struct file_lock *fl); 970 extern int ceph_flock(struct file *file, int cmd, struct file_lock *fl); 971 extern void ceph_count_locks(struct inode *inode, int *p_num, int *f_num); 972 extern int ceph_encode_locks_to_buffer(struct inode *inode, 973 struct ceph_filelock *flocks, 974 int num_fcntl_locks, 975 int num_flock_locks); 976 extern int ceph_locks_to_pagelist(struct ceph_filelock *flocks, 977 struct ceph_pagelist *pagelist, 978 int num_fcntl_locks, int num_flock_locks); 979 extern int lock_to_ceph_filelock(struct file_lock *fl, struct ceph_filelock *c); 980 981 /* debugfs.c */ 982 extern int ceph_fs_debugfs_init(struct ceph_fs_client *client); 983 extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client); 984 985 #endif /* _FS_CEPH_SUPER_H */ 986